Thank you for your question.
There are significant restrictions inside Iran with regard to the freedom of association that apply to political parties and other civil society organizations.
In the specific instance of labour rights, there are no legal independent unions inside the country. There is no minimum wage guaranteed to workers and there are practices in terms of hiring and firing workers on short-term contracts to ensure they can be employed under the minimum wage, which I think would make even the most rampant, turn-of-the-20th-century, unfettered capitalists ashamed of themselves.
Iran portrays itself as the country that stands for the oppressed, and yet its workers are among the most oppressed and least free on the face of the earth. I think this should encourage trade unions in the west and workers' organizations and governments within the context of the International Labour Organization to go after Iran for its blatant and systematic violations of workers' rights.
As you mentioned, a number of these workers and their leaders have been jailed, harassed, intimidated, and persecuted. In a number of cases, despite the fact that these people are prisoners of conscience and political prisoners, they have been transferred to either psychiatric mental health institutions or prisons where common criminals are detained, things that of course increase the risks and the dangers for their own personal safety.
They have been denied access to basic medical care, as often happens with political prisoners inside Iran. And they have been denied the most elemental rights, such as visits from relatives, in order to put pressure and intimidate their colleagues who are still at liberty to act.
I think in the landscape of human rights violations, labour rights is one of the most egregious instances where the regime has trumped basic rights, and has done so not just in a blatant fashion, but in utter disregard and in open contradiction with its own rhetoric.